Sentinel lymph node biopsy for thin melanomas under the American Joint Committee on Cancer 8th edition cancer staging system

The American Joint Committee on Cancer (AJCC) will implement the 8th edition of their cancer staging system on the 1st January 2018, with changes to the way in which thin melanomas are classified. Our understanding of these criteria contrasts with previous correspondence in this journal.1 Tumours with a Breslow thickness <0.8mm will be classified as T1a if they do not exhibit ulceration, and as T1b if they do exhibit ulceration. All tumours measuring 0.8-1.0mm thick will be reclassified as T1b regardless of ulceration.

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